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Résultats exploitables
A special technique in metal powder manufacture is used to produce improved refractory metal alloys. These tungsten and molybdenum based materials have to meet high demands not only on mechanical properties, but also on homogeneity, thermal and electric conductivity, and burn off resistance; it is therefore important to combine all the requested characteristics in an optimal way. The technological basis for this research is a Dornier developed method for the production of metallic alloy powders, the so called reaction spray process (RSV). The powders manufactured according to this process are characterised by extremely high homogeneity and sinter activity.
The achievements of the research so far are shown.
Reduction of tungsten copper oxide powder is carried out in a rotary tube furnace. Batch size was increased from about 0.5kg to 2.5-3kg. Oxide content in the metallic powder is in the range of 0.1 to 0.5%.
Tungsten copper alloys containing 50% and 25% copper respectively can be sintered to specimens showing a density between 95% and 98% of theoretical density, depending on the size of the specimen.
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